Well the title basically says it all. I have a schrader that has unwanted rubber on it. I want to use this for my pen gun that will be eventually finished. Is there any non tedious way i can do this quickly and effectively?

If you want to rush things then remove the valve core, heat up the metal tube til the rubber softens (and more than likely starts to burn) and try hauling it out.

That's the best way to do it. You could either sit it in a pot of how water or hold it over a fire for a little while. Don't heat it for to long or else the will melt in all its entirety and be a big sticky mess. Id say hold it close to a fire for like a minute or two max.